Follow President Barack Obama on Twitter and you’ll get updates from the most-followed head-of-state in the world. But don’t expect him to return the favor or engage with his followers, at least not personally.

While the president was the first world leader to join the social media network, in May 2007, and has more followers than any other, he falls short on being the most connected, according to a “Twiplomacy” study released Thursday and conducted by public relations firm Burson-Marsteller.

The president isn’t the only one, though. Only 30 of the world leaders surveyed actually tweet themselves, and most don’t do so regularly. Obama, for example, signs personal tweets with “bo,” although those are few and far between. The rest come from his campaign staff.

He also doesn’t connect much with other world leaders on Twitter. Although 76 heads of state follow him, his only two mutual follows are Norway’s Jens Stoltenberg and Russia’s Dmitry Medvedev. Nearly half of the world leaders on Twitter don’t follow any other world leader.

But Obama earns high marks when it comes to popularity, leading the field in the number of followers (and ranking fifth on Twitter overall, right behind Britney Spears). Venezuelan President Hugo Chávez is second among world leaders in followers, in May rewarding his three millionth follower with a new home.

Obama nabs another gold by having issued the most popular tweet, from May: “Same-sex couples should be able to get married,” which was retweeted 62,047 times.